Half to holcomb brothers



(No Model.)

yW. F. MORTON.

sPoKB TENON. l NO. 397,995. Patented Feb. 19, 1889.

. ft. jfl/A61 5A/(342 1| l 1W H! Z' LZ' N. PETERSA Pham-Lima rrici,

JNTE STATES PATENT WILLIAM F. MORTON, OF NEV HAVEN, CONNECTICUT, ASSIGNOR OF ONE- HALF TO HOLCOMB BROTHERS & CO., OF SAME PLACE.

SPOKE-TENON.

SPECIFICATION forming part of Letters Patent No. 397,995, dated February 19, 1889. Application filed April 4, 1888. Serial No. 269,577. (No model.)

To @ZZ waant zit may concern: neously subjected to sidewise and edgewise Be it known that I, VILLIAM F. MORTON, pressure respectively applied in diametricalresiding at New Haven, in the county of New ly-opposite directions, such corrugation forin- Haven and State of Connecticut, have ining a series ot raised retaining-points. vented certain new and useful Improvements The hub F, of which onlya portion is shown, 55 in Mortise-and-Tenon Joints; and Ido declare is provided with a mortise having, before the the following te be a full, clear, and exact detenon is driven, straight side walls, G G, and script-ion of the same, reference being had to end walls, H H, the forward end wall being' the accompanying drawings, which form astraight and the rear end wall being' inclined. Io part of this specification. The tenon and mortise are respectively 6o My invention relates to animprovoment in made so that in driving the tenon it is recompressed tenons, the object being to insisted by the end walls of themortise,wherecrease the amount of wood left in the tenon by considerable force must be employed to after boring out the hub and to interlock one drive it home. This operates to embed thc 15 or both edges ot the teilen into the walls of corrugationsof the compressed and therefore 65 the mortise. hardened tenon into the end walls of the moiL y With these ends in viewiny invention contise in which the corrugations are reproduced sists in a compressed tenon having its sides The corrugations of the tenon and the correbeveled from its neck to a point about midsponding corrugations of the end walls of the 2o Waybetween its ends and made straight below mortise, produced as described, form, as it 7o such point, and having one edge straight and were, interlocking points for holding the tenon one beveled and one edge orboth corrugated. in place. The grip so obtained is re-enforced In the accompanying` drawings, Figure 1 is bythe edgewise expansion of the tenon, owing a broken view, in side elevation, of a spoke to its compression, and the joint made is of 2F having a tenon embodying my invention. great strength and very durable. Preferably 75 Fig. 2 is a broken viev7 in elevation showing both edges of the tenon are corrugated; but, if the edge of the spoke and the back of the desired, the corrugations may be confined to tenon, the broken lines indicating the comone edge of the tenon. The joint is also repressionandpointingof the tenon for driving. enforced by the sidewise expansion of the 3o Fig. 3 is a broken sectional view showing the tenon, whereby its sides are forced into the 8o tenon in its mortise with its lower end cut straight side walls ofthe mortise, which they away, the walls of the mortise as it is origicrowd outward to conform to their contour, nallyformed being indicated by broken lilies; as shown by Fig. 3 of the drawings. Before and Fig. i is a similar view showing the tenon driving the tenon its outer end is pointed in 3 5 in side elevation and the interlockingI of its the usual manner, and after it is driven the 85 corrugated face and back with the adjacent hub is bored out or boxed, as shown by Figs. end walls of the mortise. 3 and 4 of the drawings, the end of the tenon The sides of my improved tenon are bevbeing removed below the line Where the eled, as at A A, from its neck to a point about straight and beveled portions of its sides 4o midway between its ends, andas herein shown, merge into each other, whereby the tenon re- 9o and preferably located between its center and tains more of its bulk, and hence makes a outer end. From this point the sides of the stronger joint than a tenon having its sides tenon are made straight and are parallel, as beveled from its neck to its outer end, beat B B, to its outer end. The tenon is therel cause the bulk of the tenon is increased by 45 fore straight-sided and of uniform bulk bemaking the outer portions of its sides parallel. 95 low the point where the bevel terminates. By simultaneously subjecting the tenon- The tapered back C of the tenon and its face blank to sidewise and edgeWise pressure ren D are corrugated, as at E E, up to a point spectively applied in diametrically-opposite near its neck in the operation of compressing directions, it is condensed without any injury 5o the tenon from the blank, which is simultato its fibers, and the resultant tenon retains 10o the full strength of the wood, besides being denser and stronger than an uncompressed tenen.

I ain aware that it is not new to enlarge a tenen sidewise at a point about between its ends to aid in locking it in plaee. I do not, therefore, broadly claim such a construction,

but only 'my speeile way ot' enlarging the tenen sidewise.

I am aware that the eorrugalion oi tenons to increase their capacity Afor retaining glue is not new. I do not, therefore, broadly elaiin herein the corrugation of a tenen, but only the corrugatien el? its edges for utilizing the edgewise pressure developed in driving it to einbed the m'nriigaivioiis in the end walls of the sided retaining end remains after the outer end of the tenen has been cut away in boxing the hub, substantially as set forth.

2. The combination, with a lnortised hub in which one of the end walls of each inortise is inclined inward, of a Compressed spoke-tenen having a straight edge and a beveled edge, one or both edges of the tenen being corrugated for forming retaining-points which are forced into the hub, when the tenen is driven, by the leverage seenred by the beveled edge of the tenen and the inclined wall of the niortise, and forni corresponding retaining-points therein, the retaining-'points oi' the tenon interlocking under its edgewise expansion with those of the hub and forming a long series of interloeking poin ts holding the tenoir in place, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two snbseribing witnesses,

IVILLIAM l. ).IUI-l'lON. Witnesses:

CHAs. B. SHUMw-w, II. HALL. 

